
	import javax.swing.*;
	 
	import org.math.plot.*;
	 
	import static java.lang.Math.*;
	 
	import static org.math.array.DoubleArray.*;
	 
	public class main {
		public static void main(String[] args) {
	 
			// define your data
			double[] x = increment(0.0, 0.1, 1.0); // x = 0.0:0.1:1.0
			double[] y = increment(0.0, 0.05, 1.0);// y = 0.0:0.05:1.0
			double[][] z1 = f1(x, y);
			double[][] z2 = f2(x, y);
	 
			// create your PlotPanel (you can use it as a JPanel) with a legend at SOUTH
			Plot3DPanel plot = new Plot3DPanel("SOUTH");
	 
			// add grid plot to the PlotPanel
			plot.addGridPlot("z=cos(PI*x)*sin(PI*y)", x, y, z1);
			plot.addGridPlot("z=sin(PI*x)*cos(PI*y)", x, y, z2);
	 
			// put the PlotPanel in a JFrame like a JPanel
			JFrame frame = new JFrame("a plot panel");
			frame.setSize(600, 600);
			frame.setContentPane(plot);
			frame.setVisible(true);
	 
		}
	 
		// function definition: z=cos(PI*x)*sin(PI*y)
		public static double f1(double x, double y) {
			double z = cos(x * PI) * sin(y * PI);
			return z;
		}
	 
		// grid version of the function
		public static double[][] f1(double[] x, double[] y) {
			double[][] z = new double[y.length][x.length];
			for (int i = 0; i < x.length; i++)
				for (int j = 0; j < y.length; j++)
					z[j][i] = f1(x[i], y[j]);
			return z;
		}
	 
		// another function definition: z=sin(PI*x)*cos(PI*y)
		public static double f2(double x, double y) {
			double z = sin(x * PI) * cos(y * PI);
			return z;
		}
	 
		// grid version of the function
		public static double[][] f2(double[] x, double[] y) {
			double[][] z = new double[y.length][x.length];
			for (int i = 0; i < x.length; i++)
				for (int j = 0; j < y.length; j++)
					z[j][i] = f2(x[i], y[j]);
			return z;
		}
	}
	
	
	


